Hydrogen Diffusion and Permeation through Duplex Membrane of Cu–Ni and Cu–Fe

Abstract

In order to understand the hydrogen permeation phenomena in multiple metal layers, the time dependent permeation rates for duplex membranes of Cu-Ni and Cu-Fe have been systematically measured under hydrogen pressures from 103 to 105 Pa at temperatures from 500 to 1000K, and the obtained results are compared with theoretical estimations calculated from the diffusion equation.In the case of the Cu-Ni duplex membrane, both injection and evolution transients are hardly influenced by the surface effect, and the permeation behavior is well described by the theory. In the case of the Cu-Fe one, the steady state permeation rate also agrees well with the theory, while the time transient seems to be influenced by the surface oxide or the bulk trapping effect.

Application of a Tritium Imaging Plate Technique to Depth Profiling of Hydrogen in Metals and Determination of Hydrogen Diffusion Coefficients

“…One can see that the T pro les are quite inhomogeneous with localized high intensity area appeared as small spots all over the surfaces and lines near the edges of the samples. T intensities were averaged over the whole sample surface area and compared with H concentrations calculated with using the reported H solubility of respective metals [19][20][21] under the present H loading condition in Fig. 4(b).…”

Reducing Hydrogen Permeation through Metals

“…If the binding enthalpy of the trap is, on the other hand, lower than the Oriani threshold, the trap is considered as reversible and can both capture and release hydrogen atoms. Due to their many technological applications and scientific interest, permeation of hydrogen and trapping formation mechanisms have been the subject of many investigations both in the past [1][2][3][4][5][6][7][8][9] as well as in more recent years [10][11][12][13][14][15][16][17].…”